fix(schedule): preserve resumed ancestor receipts

.agents/notes/implemented/feature/2026-08-05-durable-web-schedule.md

@@ -49,7 +49,7 @@ Agent or plugin disposal cancels timers, stops new work, unwinds the three tool
 
 ### Commit-aware Web receipt
 
-The Schedule package owns `scheduleReminderPresentation()`, which derives `{ scheduleId, prompt, occurrenceAt, deliveryMode }` from create plus dispatch. A dispatch inside an inherited fork prefix folds from its nearest preceding `session/end-seed` boundary, preserving nested-generation id reuse; a child-owned dispatch folds only the child suffix. Presentation therefore never changes live ownership.
+The Schedule package owns `scheduleReminderPresentation()`, which derives `{ scheduleId, prompt, occurrenceAt, deliveryMode }` from create plus dispatch. The current fork's `seedLength` is a hard boundary for child-owned dispatches. An inherited dispatch instead pairs with its nearest preceding same-id create because `session/end-seed` also marks replay or resume construction, not only fork ownership. This keeps resumed ancestor receipts renderable, preserves nested-generation id reuse, and never changes live ownership.
 
 The Host continues to send every raw event on append. It keeps one monotonic watermark per exact live `Session` in a `WeakMap`; only `session/flushed` advancement makes it redeliver newly covered dispatch events with the generic `{ for: 'event', view }` sidecar. The durable `schedule/change` type selects the client renderer. Taking the maximum contains reversed concurrent flush completion, and exact object identity prevents a reused Session id from inheriting another lifecycle's cursor.
 

.agents/notes/implemented/feature/2026-08-05-durable-web-schedule.zh.md

@@ -49,7 +49,7 @@ Agent 或插件 dispose 会取消 timer、停止新工作、撤销三个工具
 
 ### Commit-aware Web 回执
 
-Schedule package 拥有 `scheduleReminderPresentation()`，从 create 加 dispatch 派生 `{ scheduleId, prompt, occurrenceAt, deliveryMode }`。位于继承 fork 前缀中的 dispatch 会从其最近的前置 `session/end-seed` 边界开始折叠，保留嵌套 generation 的 id 复用；child 自有 dispatch 只折叠 child 后缀。因此 presentation 永远不会改变 live ownership。
+Schedule package 拥有 `scheduleReminderPresentation()`，从 create 加 dispatch 派生 `{ scheduleId, prompt, occurrenceAt, deliveryMode }`。当前 fork 的 `seedLength` 是 child 自有 dispatch 的硬边界。继承的 dispatch 则会与它之前最近的同 id create 配对，因为 `session/end-seed` 也会标记回放或恢复构造，而不仅标记 fork 所有权。这使恢复后的祖先回执仍可渲染，保留嵌套 generation 的 id 复用，并且绝不会改变 live ownership。
 
 Host 在 append 时继续发送所有 raw event。它在 `WeakMap` 中按 exact live `Session` 保存一个单调 watermark；只有 `session/flushed` 前进时，才会用通用 `{ for: 'event', view }` sidecar 重投新覆盖的 dispatch event。持久 `schedule/change` 类型用于选择 client renderer。取最大值可以收容反序完成的并发 flush，按对象身份键控则阻止复用的 Session id 继承另一个生命周期的 cursor。
 

packages/host/apiproxy/src/api-proxy.ts

@@ -470,8 +470,8 @@ function viewFor(ctx: Context, event: SessionEvent, argsFor: (callId: string) =>
 
 /**
  * Derive one Schedule-owned event sidecar without allowing corrupt domain data
- * to break raw event delivery. `seedLength` selects the parent-prefix or
+ * to break raw event delivery. `seedLength` keeps a child-owned dispatch inside
- * child-suffix ownership segment inside the package helper.
+ * its own suffix while the package helper pairs inherited receipts by id.
  */
 function scheduleViewFor(
   ctx: Context,

packages/host/apiproxy/tests/api-proxy-schedule-view.spec.ts

@@ -22,6 +22,20 @@ interface FlushControl {
   handler: () => true | Promise<true>
 }
 
+function reminderCreateData(id: string, prompt: string) {
+  return {
+    version: 1 as const,
+    operation: 'create' as const,
+    schedule: {
+      id: ScheduleId(id),
+      kind: 'after' as const,
+      prompt,
+      afterSeconds: 1,
+      scheduledAt: '2026-08-05T12:00:01.000Z',
+    },
+  }
+}
+
 async function harness(control?: FlushControl): Promise<Context> {
   const ctx = new Context()
   await ctx.plugin(SessionStore)
@@ -39,17 +53,7 @@ function appendReminder(
   prompt: string,
 ): { create: SessionEvent; dispatch: SessionEvent } {
   const scheduleId = ScheduleId(id)
-  const create = session.append('schedule/change', {
+  const create = session.append('schedule/change', reminderCreateData(id, prompt))
-    version: 1,
-    operation: 'create',
-    schedule: {
-      id: scheduleId,
-      kind: 'after',
-      prompt,
-      afterSeconds: 1,
-      scheduledAt: '2026-08-05T12:00:01.000Z',
-    },
-  })
   const dispatch = session.append('schedule/change', {
     version: 1,
     operation: 'dispatch',
@@ -148,6 +152,45 @@ describe('commit-aware Schedule live views', () => {
 })
 
 describe('Schedule history views', () => {
+  it('presents a resumed ancestor dispatch copied into a fork seed', async () => {
+    const ctx = await harness()
+    const scheduleId = ScheduleId('resumed-reminder')
+    const resumed = ctx.sessions.create(SessionId('schedule-resumed'), {
+      seed: [{
+        type: 'schedule/change',
+        seq: 0,
+        time: 1,
+        data: reminderCreateData('resumed-reminder', 'after restart'),
+      }],
+      meta: { cwd: '/tmp' },
+    })
+    const dispatch = resumed.append('schedule/change', {
+      version: 1,
+      operation: 'dispatch',
+      id: scheduleId,
+    })
+    const child = ctx.sessions.fork(resumed, undefined, SessionId('schedule-fork'))
+    ctx.provide('sessionPersistence', {
+      inspect: () => Promise.resolve({ meta: child.header, events: [...child.events] }),
+    } as never)
+    const api = createApiProxy(ctx, { provider: 'p', model: 'm', cwd: '/tmp', workspaceRoot: '/tmp' })
+
+    const response = await api.sessions.history({
+      rpcId: RpcId('schedule-resumed-fork'), payload: { sessionId: child.id },
+    })
+    if (!response.result.ok) throw new Error(response.result.error.message)
+    expect(response.result.value.events.find(entry => entry.event.seq === dispatch.seq)?.view).toEqual({
+      for: 'event',
+      view: {
+        scheduleId,
+        prompt: 'after restart',
+        occurrenceAt: '2026-08-05T12:00:01.000Z',
+        deliveryMode: 'session-local',
+      },
+    })
+    await ctx.fiber.dispose()
+  })
+
   it('uses only the attached identity-matching stored prefix and fails soft to raw history', async () => {
     const ctx = await harness()
     const parent = ctx.sessions.create(SessionId('schedule-parent'), { meta: { cwd: '/tmp' } })

packages/schedule/tool-schedule/README.md

@@ -16,7 +16,7 @@ The package owns the strict version-1 `schedule/change` create, delete, and disp
 
 Replay rejects unknown versions, extra fields, reused ids, and delete or dispatch transitions against inactive records. Normal sessions fold the complete log. A fork folds only `session.events.slice(session.header.seedLength ?? 0)`, so it does not inherit its parent's reminders. The package's `./invariant` companion applies the same policy to existing logs and candidate events.
 
-`scheduleReminderPresentation(events, dispatchSeq, seedLength)` is the pure Host-facing receipt projection. It pairs a dispatch with the active create in the same ownership segment and returns `scheduleId`, prompt, occurrence, and `session-local` mode. A dispatch inside a persisted fork prefix folds from its nearest preceding `session/end-seed` boundary, so nested generations may reuse session-local ids without hiding ancestor receipts; a child-owned dispatch folds only the child suffix, so presentation never changes live ownership.
+`scheduleReminderPresentation(events, dispatchSeq, seedLength)` is the pure Host-facing receipt projection. It returns `scheduleId`, prompt, occurrence, and `session-local` mode from the dispatch's nearest preceding same-id create. The current fork's `seedLength` is a hard boundary for child-owned dispatches, while inherited dispatches search their persisted prefix; resumed ancestors therefore remain renderable, nested generations may reuse session-local ids, and presentation never changes live ownership.
 
 ## Management tools
 

packages/schedule/tool-schedule/README.zh.md

@@ -16,7 +16,7 @@
 
 回放会拒绝未知版本、额外字段、重复使用的 id，以及针对非活动记录的 delete 或 dispatch 转换。普通会话折叠完整日志。fork 只折叠 `session.events.slice(session.header.seedLength ?? 0)`，因此不会继承父会话的提醒。此包的 `./invariant` 配套项会对现有日志和候选事件应用相同策略。
 
-`scheduleReminderPresentation(events, dispatchSeq, seedLength)` 是供 Host 使用的纯回执投影。它把 dispatch 与同一 ownership segment 中的活动 create 配对，并返回 `scheduleId`、prompt、occurrence 和 `session-local` 模式。位于已持久 fork 前缀中的 dispatch 会从最近的前置 `session/end-seed` 边界开始折叠，因此嵌套 generation 可以复用会话本地 id，而不会隐藏祖先回执；child 自有 dispatch 只折叠 child 后缀，因此 presentation 绝不会改变 live ownership。
+`scheduleReminderPresentation(events, dispatchSeq, seedLength)` 是供 Host 使用的纯回执投影。它从 dispatch 之前最近的同 id create 返回 `scheduleId`、prompt、occurrence 和 `session-local` 模式。当前 fork 的 `seedLength` 是 child 自有 dispatch 的硬边界，而继承的 dispatch 则会搜索其已持久前缀；因此恢复后的祖先仍可渲染，嵌套 generation 可以复用会话本地 id，presentation 绝不会改变 live ownership。
 
 ## 管理工具
 

packages/schedule/tool-schedule/src/domain.ts

@@ -289,10 +289,9 @@ export function scheduleView(record: AfterScheduleRecord, now: number): Schedule
 
 /**
  * Derive the Web receipt for one dispatch from its owning stream segment.
- * A dispatch inside an inherited fork prefix folds from its nearest preceding
+ * A child-owned dispatch cannot cross the current fork's `seedLength`.
- * `session/end-seed` boundary; a child-owned dispatch folds only the child
+ * An inherited dispatch pairs with its nearest preceding same-id create, so
- * suffix. Nested forks can therefore reuse session-local ids without hiding a
+ * resumed ancestors remain renderable and nested forks may reuse local ids.
- * persisted ancestor receipt in descendant history.
  * @param events - Complete contiguous Session log.
  * @param dispatchSeq - Exact event seq to present.
  * @param seedLength - Inherited fork prefix length.
@@ -317,20 +316,34 @@ export function scheduleReminderPresentation(
   const dispatch = decodeScheduleChange(event.data)
   if (dispatch.operation !== 'dispatch') return undefined
 
-  const segmentStart = dispatchSeq < seedLength
+  const segmentStart = dispatchSeq < seedLength ? 0 : seedLength
-    ? events.slice(0, dispatchSeq).findLastIndex(candidate => candidate.type === 'session/end-seed') + 1
+  for (let index = dispatchSeq - 1; index >= segmentStart; index -= 1) {
-    : seedLength
+    const candidate = events[index]
-  const before = foldScheduleEvents(events.slice(segmentStart, dispatchSeq))
+    if (candidate?.type !== 'schedule/change') continue
-  const record = before.active.find(candidate => candidate.id === dispatch.id)
+    const change = decodeScheduleChange(candidate.data)
-  if (record === undefined) {
+    switch (change.operation) {
-    throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
+      case 'create':
+        if (change.schedule.id !== dispatch.id) break
+        return Object.freeze({
+          scheduleId: change.schedule.id,
+          prompt: change.schedule.prompt,
+          occurrenceAt: change.schedule.scheduledAt,
+          deliveryMode: 'session-local',
+        })
+      case 'delete':
+      case 'dispatch':
+        if (change.id === dispatch.id) {
+          throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
+        }
+        break
+      /* v8 ignore next 3 -- decodeScheduleChange returns a closed operation union. */
+      default: {
+        const unreachable: never = change
+        throw new ScheduleLogError(`unknown decoded schedule change ${String(unreachable)}`)
+      }
+    }
   }
-  return Object.freeze({
+  throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
-    scheduleId: record.id,
-    prompt: record.prompt,
-    occurrenceAt: record.scheduledAt,
-    deliveryMode: 'session-local',
-  })
 }
 
 /**

packages/schedule/tool-schedule/tests/domain.spec.ts

@@ -122,6 +122,33 @@ describe('version-1 Schedule decoding and folding', () => {
       occurrenceAt: '2026-08-05T12:00:00.000Z',
       deliveryMode: 'session-local',
     })
+    const resumedThenForked = [
+      scheduleEvent(createData('resumed-id', 'resumed prompt'), 0),
+      { type: 'session/end-seed', seq: 1, time: 1, data: {} } as SessionEvent,
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'resumed-id' }, 2),
+    ]
+    expect(scheduleReminderPresentation(resumedThenForked, 2, 3)).toEqual({
+      scheduleId: 'resumed-id',
+      prompt: 'resumed prompt',
+      occurrenceAt: '2026-08-05T12:00:00.000Z',
+      deliveryMode: 'session-local',
+    })
+    expect(() => scheduleReminderPresentation([
+      scheduleEvent(createData('parent-only'), 0),
+      { type: 'session/end-seed', seq: 1, time: 1, data: {} },
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'parent-only' }, 2),
+    ], 2, 2)).toThrow(/inactive id/)
+    expect(scheduleReminderPresentation([
+      scheduleEvent(createData('target'), 0),
+      scheduleEvent(createData('other'), 1),
+      scheduleEvent({ version: 1, operation: 'delete', id: 'other' }, 2),
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'target' }, 3),
+    ], 3)).toMatchObject({ scheduleId: 'target' })
+    expect(() => scheduleReminderPresentation([
+      scheduleEvent(createData('ended'), 0),
+      scheduleEvent({ version: 1, operation: 'delete', id: 'ended' }, 1),
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'ended' }, 2),
+    ], 2)).toThrow(/inactive id/)
     expect(scheduleReminderPresentation(events, 2, 2)).toBeUndefined()
     expect(scheduleReminderPresentation([
       { type: 'session/end-seed', seq: 0, time: 1, data: {} },